Fig. 2

VR-BSVF in healthy volunteers and patients with diplopia. (a) VR-BSVF of healthy volunteers; (b) VR-BSVF of patients with diplopia. VR-BSVF is defined as the area of the irregular polygon enclosed by all identified target positions, whereas VR-BSVD represents the sum of distances from the center point to all identified peripheral target positions, used to describe the morphology of the binocular single visual field.